Thread cutting mechanism for looms



Aug. 21, 1-934. DQUGLAS 1,971,256

I THREAD CUTTIN MECHANISM FOR Lboms Filed Sept. 28. 1933 INVENTOR. l

W/T/VESS.

awn/95mg fiefa/ac 5 0 0 01 Patented Aug. 21, 1934 Fredric E. Douglas, Hopedale, Mass, assignor to Draper Cerporation, Hopedale, Mass, at corporation of Maine Application September 28, 1933, Serial No. 691,363

7 Claims. (Cl. 139-266) The present invention pertains to intermittent temple thread cutting mechanism for looms, and has more particular reference to the timing means thereof and the means controlled by the timing means for rendering the thread cutting mechanism inoperative. v The object of my invention is to provide a novel and improved device of the type mentioned, as hereinafter more fully set forth and as defined in the appended claims.

The preferred embodiment of my invention is shown on the accompanying drawing, of which:

Fig. l is a plan view of a temple and thread'cutting mechanism constitutingthe said preferred embodiment; i

Fig. 2 is a side elevation of the device of Fig. 1, certain contiguous parts of the loom appearing in section; and 7 Fig.3 is a vertical sectional view on a plane just toone side of the thread cutting blades.

The temple shown on the drawing is mounted on the breast beam 1 of the loom by means of a bracket 2 supporting a stand or housing 3. The temple bar 4, which carries the head 5, is mounted for reciprocation in the stand 3 in the usual manner. Reciprocation of the temple occurs, as is usual, when the lay 6 at the forward end of its stroke strikes a heel 7 depending from the head 5.

The temple is adapted to be mounted on the filling replenishing side of an automatic filling replenishing loom, and accordingly carries a thread cutting mechanism for trimming the filling ends left projecting from the selvage at the time of transfer. The particular thread cutting mechanism shown is comprised of a flat blade 8 mounted in a guideway in the temple head and having a slot (see Fig. 3) engaging a pin 9 in the head whereby the blade is capable of rectilinear movement forwardly and rearwardly in the guideway. Pivoted to the blade 8 as at 10 is a cutting blade 11 having a curved slot 12 engaging the fixed pin 9 whereby, as the blade 8 is reciprocated, the blade 11 will move bodily therewith and will also pivot, at 10, to bring the cutting edge 13 into and out of engagement with the cutting portion 14 of the blade 8.

The temple and cutting mechanism as thus far described are not, per se, of the present invention, and other suitable constructions may be substituted therefor as desired.

The present invention includes a regularly reciprocating actuator for actuating a thread-cutter operating element and means for withdrawing the element laterally of the path of the actuator for rendering the thread cutting mechanism inoperative. In the preferred embodiment of such construction the actuator is comprised of the lay and lay bunter 15, the latter having a laterally extending nose 16 for a purpose to be described.

A support 1'? is pivotally suspended on a stud 18 carried by the temple bar 4. This support carries a pin 19 engaging in a slot 26 in the thread cutter blade 8, for reciprocating the blade in an obvious manner. The thread-cutter-actuating element 21 is mounted in the support 17 for ver-- tical sliding movement to an extent limited by slot 22 which engages the stud 18. When the element 21 is in its lowermost position, as shown, it projects into the path of and will be oscillated by the nose 16 of the hunter and a pad 23 on the lay, for operating the thread cutting mechanism.

The element 21 is raised out of the path of the bunt-er after a predetermined number of operations of the thread cutting mechanism. To this end, a follower pin 24 projects laterally from the element into engagement with a cam 25. The cam is fixed to a ratchet wheel 26 journalled on the stud 18. The ratchet wheel reciprocates bodily with the temple and is thus moved against and rotated by the normally stationary pawl 2'7. When the cam has been thus rotated through substantially one complete revolution the nose 28 thereof, engaging follower pin 24, automatically raises the element 21 out of the path of the hunter and the thread cutting mechanism will become idle. A relatively long fiat space 29 on the ratchet wheel is, at this time, positioned beneath the pawl 27. Thus, the ratchet wheel may be reciprooated beneath the pawl without being rotated thereby.

The thread cutting mechanism may be returned to operation at time of filling replenishment by a finger 30 connected to the replenishing mechanism, not shown. This finger, at the desired time, moves rearwardly to push the pawl 27 rearwardly along the screws 31, 31 against the action of spring 32. The rearward movement of the pawl 27 rotates the ratchet wheel to the point where the fiat 29 is past the normal position of the pawl, thus restoring the pawl-andratchet to operation. Simultaneously, the nose 28 of the cam moves from beneath follower pin 24, thus projecting the element into the path of the bunter.

By withdrawing the element 21 laterally of the path of its actuator in the manner above indicated I avoid any possibility of the element and thread. cutting mechanism being moved slightly each reciprocation of the lay as might happen if the element were merely latched at the forward end of its operating stroke.

Having fully disclosed the preferred embodiment of my invention, I claim:

1. In combination with a loom temple, thread cutting mechanism carried by said temple, actuating means operating in a given path, means connected with said thread cutting mechanism and projected into said path for operating the thread cutting mechanism and means for withdrawing said second mentioned means from said path transverselythereof after a predetermined number of operations of said thread cutting.

mechanism.

2. In combination with a loom lay, a loom temple, thread cutting mechanism carried by said temple, a bunter on said lay, an element connected with said thread cutting mechanism and projected into the path of said bunter for operating the thread cutting mechanism, and means for raising said element out of said path after a predetermined number of operations of said thread cutting mechanism.

3. In combination with a loom lay, a loom temple, thread cutting mechanism carried by said temple, a bunter on said lay, an element connected with said thread cutting mechanism and projeoted into the path of said bunter for operating the thread cutting mechanism, cam means for raising said element out of said path, and means for operating said cam.

i. In combination with a loom temple, thread cutting mechanism carried by said temple, actuating means operating in a. given path, an element supported for pivotal movement under the influence of said actuating means and vertical sliding movement into and out of operative relation to said means, said element being connected to said thread cutting mechanism for operating the latter, and means for automatically raising and lowering said element.

5. In combination with a loom lay, a loom temple, thread cutting mechanism carried by said temple, a bunter on said lay, an element supported for pivotal movement by said bunter and vertical sliding movement into and out of the path of said bunter, said element being connected to said thread cutting mechanism for operating the latter, and means including a cam for automatically raising and lowering said element.

6. In combination with a loom lay, a loom temple, thread cutting mechanism carried by said temple, a member pivotally suspended from said temple and connected to said thread cutting mechanism for operating the latter, an element supported for pivotal movement with said member but vertically slidable relative thereto, means engaging said element for oscillating the element when the same is in its lowermost position, and means for raising said element out of engagement with said means after a predetermined number of operations of said thread cutting mechanism.

'7. In combination with a loom lay, a loom temple, thread cutting mechanism carried by said temple, a member pivotally suspended from said temple and connected to said thread cutting mechanism for operating the latter, an element supported for pivotal movement with said member but vertically slidable relative thereto, means engaging said element for oscillating the element when the same is in its lowermost position, a cam for raising said element out of engagement with said means, and a pawl and ratchet operated by reciprocation of said temple for rotating said cam.

FREDRIC E. DOUGLAS. 

